subthreshold

[suhb-thresh-ohld, -thresh-hohld]
adjective Psychology, Physiology.
(of a stimulus) too weak to produce a response.

Origin:
1940–45; sub- + threshold

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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The majority of these patients are suffering from a subthreshold depression.
For all diagnoses symptoms are coded as present, subthreshold, or absent.
Symptoms are often subthreshold and likely continuous with normal experience.
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